Seaming machine



vJuly 20, 1943.

W. J. GEISTk SEAMING MACHINE Filed Feb. 17, V1941 2 Sheets-Sheet l .July 20, 1943. w 1 GElsT 2,324,501

SEAMING MACHINE Filed Feb. 17, 1941r 2 Sheets-Sheet 2 Patented July zo, 1943 `sEAMINo. MACHINE William J. Geist, St. Louis, Mo., assignor, by

mesne assignments, to Continental Can Oompany, Inc., New York, N. Y., a corporation of New York Application February 17, 1941, Serial No. 379,335

12 Claims.

. This invention `relates to machines useful in the manufacture of containers and relates more particularly to machines for seaming heads or ends on containers. A general object of this invention is to provide a simple, inexpensive and Another object of this invention is to provide a machine for seaming the ends on containers in' which the container ends are seamed on the container bodies without employing rotating rollers or dies thereby greatly simplifying vthe construction and materially reducing the cost of manufacture. l

Another object of this invention is to provide a seaming machine of the character referred to in which the container may remain stationary throughout the seaming operation to eliminate the necessity for a mechanism for shifting` the container to and from the sealing chuck and providing for a greater operating speed.

Another object of this invention is to'provide 'a seaming machine of the character referred to embodying a novel seaming head in which the chuck elements, the die operating parts, etc. are telescopically related for relative movement along a common axis to permit'the easy placement and removal of the containers and to produce an efficient die actuation.

Another object of this invention is to provide a. machine of the character mentioned embodying particularly effective dies and die operating means which may be constructed for the seaming.

of container heads or ends of practically any shape. I

A further object of the invention is to provide a seaming machine of the character referred to in which the dies, the chuck parts, the die operating means and other' parts of the seaming head are simple and inexpensive to manufacture and are readily installed and replaced to adapt the machine for the seaming of containers and container ends of different shapes and sizes;

y The various objects and features of my invention will be fully understood-from the following detailed description of a typical preferred form and application of my invention. throughout which description reference is made to the accompanying drawings, in which:

Fig. 1 is a side elevation of the major portion of the machine with the frame and the toggle means in vertical cross section. Fig. 2 is a fragmentary front view of the machine. Fig. 3'is an enlarged fragmentary vertical detailed sectional view illustrating the clutch. Fig. .4 is a fragmentary vertical detailed sectional view of the clutch taken as indicated by line 4 4 on Fig. 3. Fig. 5 is an enlarged vertical detailed sectional view of the seaming head and adjacent parts showing the head 'in the raised or unactuated position. Fig. 6 is a view similar to Fig. 5 showing the seaming head in the operated condition with the dies in the seam forming positions. Fig. 7 is a horizontal detailed sectional view taken substantially as indicated by li'ne 1-1 on Fig. 5. Fig. 8 is an enlarged fragmentary vertical detailed sectional view of the seaming head showing a die in its final seam forming position and Eig. 9 is a. fragmentary vertical detailed sectional view of the seaming head illustrating one of the connecting and stop bolts.

The seaming machine of the present invention may be said to comprise, generally, a frame I0, a power driven operating means I I carried by the frame I Il, and a'seaming head H operated by the means Il and comprising a chuck I2, dies I3 carried by the chuck and operating means I4 for the dies.

The frame Ill serves to carry the various parts of the machine and may be varied greatly in design and construction depending upon the size and capacity of the machine. In the typical case illustrated the frame lli is a generally upright structure carried by suitable legs I5. The frame I0 may have a ange I6 attached to the legs I5. The upper part of the frame I0 embodies a pair of spaced upright plate-like supports I1. A web I8 extends between and connects the Alower parts of the supports Il and has a forwardly facing mounting surface I9 provided with a vertical slot or lchannel 2li. f

The operating means II is provided to reciprocate or operate the seaming head H. The opf erating means II may be varied greatly depending upon the size and capacity of the machine means II is a continuously operating power means having a manually'controlled clutch drive for operating the head H.

The operating means in the embodiment illus- `V trated includes a generally horizontal shaft 2| rotatably carried by the spaced supports I1. The shaft 2| is formed to have an eccentric or crank 22 between the supports I1. The crank 22 operates a toggle mechanism which in turn operates the head H. A connecting rod 23 has a suitable bearing 24 on the crank 22 and extends forwardly to the toggle mechanism. A pair of toggle links 25 is supported by a horizontal shaft 28 on the supports I1 and the links 25 extend downwardly at opposite sides of the connecting rod 23. The lower parts of the links 25 are yoked to receive the upper end portions of the lower toggle links 21. A horizontal connecting pin 28l \p asses through openings in the rod 23 and the links 25 and 21 to operatively connect the rod 23 with the toggle links. A generally horizontal wrist pin 28 is turnably received in openings in the lower parts of the links 21. It will be seen that the crank 22 serves to reciprocate or move the wrist pin 28 up and down through the medium of the toggles 25 and 21. A tension spring 28 may have its ends anchored .to the pins 25 and 28 to assist the return movement of the wrist pin 28 and seaming head H.

The drive for the crank shaft 2| may comprise a pulley or wheel 38 freely turnable on an extension of the shaft. A suitable electric motor 3| to seam metal ends E oncontainer bodies or conis mounted on the frame I8 by a bracket 32 and is positioned below the wheel 38. A belt 33 operates overa pulley 34 on the motor shaft and over the wheel 38 so that the motor may continuously rotate the wheel 38. The bracket 32 may be adjustable on the frame I8 to tighten the belt 33. The motor 3| may be in continuos operation when the machine is in use and may be controlled in any selected way.

A manually controlled clutch is provided for connecting the motor driven wheel 38 with the crank shaft v2|. This clutch may be of any selected type. In the particular case illustrated the clutch includes a clutch sleeve 35 slidably keyed on the shaft 2|. The sleeve 35 and the wheel 38 have teeth 36 which are engageable for the transmission of rotation from the wheel to the shaft 2 I. A spring 31 may be arranged under compression between the sleeve 35 and the adjacent frame support I1 to urge the sleeve to its clutched position. The means for declutching the sleeve 35 comprises a lever` 38 pivotally mounted on the frame I8 to extend under the sleeve 35. The lever 38 is arranged to engage a cam face 38 on the sleeve 35 to shift the sleeve to the released or declutched position where the teeth 36 are out of engagement. A spring 48 is connected with the lever 38 to urge the lever upwardly for cooperation with the cam face 38.

A rod 4I is pivotally. connected with the lever 38 and has a manual operating part for the control of the lever. As illustrated in Fig. 2 a pedal 42 may be provided to operate the rod 4|. The

spring 48 may serve to normally urge the lever be embodied in the machine and the invention.

is not restricted to the use of this particular formv of clutch.

The machine preferably includes a support or asa-1,501v

the table-44 at the selectedheights. A block 48vr of suitable shape is removably attached to the upper side of the table 44 to position or locate the rcontainers in vertical alignment with the seaming head H. The locating block 48 may be` varied in size,` shape and tainers of different kinds.

The seaming head H embodies important features of the invention. 'I'he head H may be position to locate convaried in design and construction to act on orv handle container ends of different constructions, shapes and sizes. In the typical embodiment of the inventionillustrated the head H is designed tainers C of paper, cardboard, or similar fibrous material and thecontainersand-'their ends are polygonal or rectangular. The metal ends E are supplied with preformed axial flanges 48, rims 58 extending radially or outwardly from the flanges 49 and partially formed beadsor seam vcurls 5I depending from the rims 58. 'I'hevde-r tails of a container end E are best shown in Fig. 8. The axial ange 48 ofthe end E is adapted to fit within the wall of the container C and the rim 58 is adapted to rest on the edge or-end of the container body. Prior to the seaming operation the bead or curl 5| is spacedy a suilicient distance from the flange 43 to Vallow the edge of the container body or container C to be freely received between the flange and curl. This allows the head or end E to be' readily arranged on the container C for the seaming operation. The corners of the polygonal containerC and the end E are suitably rounded. The depressed major portion of the container end E maybe fiat as shown, it .being apparent that it may be corrugated or otherwise shaped if desired.

The structure or assembly of the head* H,

which I have termed the chuck I2, carries the.

dies 3 and is adapted to engage within the container end E to forma backing or support for the flange 43 and the wall of the container C to prevent distortion of .these parts during the seaming operation. The chuck I2 includes an anvil or chuck block 52 and a carrier block 53. The chuck block 52 is shaped and proportioned to fit within the` container end E to form a backing or anvil during theY seaming operation. Accordingly, in the case illustrated, the block 52 is generally rectangular with rounded corners and is proportioned to rather Vclosely ilt within thev flange 48 of the end E. 'I'he lower end of the block 52 may be flat and horizontal to engage with or lie parallel tothe `upper face of the container end E. 'I'he upper vend of the chuck block 52 is flat and horizontal but is stepped back at its edge to provide' an upwardly facing shelf 54.A The lshelf 54 is preferably continuous throughout the edge of the block 52 and lis smooth or finished. The upper end of the ychuck block 52 engages against the lower facerof the carrier block 53. A. cap screw 55 is passed through a central openingy in the. chuck block 52 and is threaded into the carrier block 53 to removably'attach the block 52 to the block 53.

asaeoor The head of the screw Il is recessed or set in the lower end of the block l2. The carrier block ll is preferably a cylindrical member considerably larger in diameter or horizontal dimensions than the'chuck block I2 and is of substantial .boss I of reduced diameter is formed on the upper end'of the carrier block Il. l

The chuck I2 is supported for limited vertical movement between the-raised position shown in Figs.y 1, 2 and 5 where they container C maybe readily positioned under head H and the lowered position of Fig. 6 w ere the chuck block 52 engages in the container end E. .A stem or stud l1 is threaded in a `central opening in the carrier block Il and extends upwardly from the block. The stud ,I1 is preferably shouldered to engage against the upper endof the boss Il, as illustrated in Figs. 5` and 6. A guide Il is attached to the front face 2li of themachine frame Il by spaced screws or bolts Il and has a central vertical opening Il slidably receiving the `*stud 51. The head BI of 'the stud 51 is engageable .with the upper side of the guide l! to limit the o porting and guiding the dies.

ment of thechuck i2. The guide $0 may have y a tongue l2 engaged in the'channel 20 of the machine frame I0. e.

The dies I3 are carried by the chuck I2-and are operable by the means Il to press the seam curl II inwardly into gripping and sealing cooperation with the container C to complete the seam. There is a series or plurality oi' like dies Il carried by the chuck I2 for `sliding movement between expanded inactive positions and contracted positions where they form the seam. While the number of dies I3 may be varied in diilerent'installations I have found it desirable to employ four dies in the form of the invention shown. The dies il are generally segmental in shape having curved peripheral` faces 83 and convergent generally radial edge faces M. The peripheral faces 83 of the` dies I3 slope downwardly and outwardly and are finished for engagement by the means I4, as will be later described. `The upper and lower sides of the dies Il are preferably `flat and parallel.

The inner edges of the seaming dies Il are shaped or contoured to give the seam curl Mits nal configuration. in theo'case illustrated, the inner edges of the diesel! are angular to each' engage against and conform toa corner and the adjacent parts of the container end E; The shape of the dies I3 is such `that the die assembly engages completely around the end E when Acontracted `onto the seam and the edges 84v come into engagement or almost engage at this time so that there is unbroken engagement between the dies and the edge ofthe vcontainer end E. The inner edge of each'die `I3 hasa i downwardly facing shoulder 6l and a groove 86 whose wall continues outwardly from the shoulder 85. 'I'he grooves 66 face inwardly and are shaped to receiveand form the seam curl 5I. The shoulders are adapted to slidablyride on the` rim 50 to prevent bending or distortion of the seam when the dies move inwardly to complete the shaping rof the seam curl 5I and slidably rest on the shelf 54. As illustrated in Fig. 8 ofthe drawings, the grooves "BO are shaped to bend the seam curl` IlV downwardly and inwardly yso that it tightly grips the wall of the to assist in brilmina rthe container C into the correct relation'to the chuck block l! and dies` Il. The die shoulders Il slidably bear on the shelf I4 ofthe chuck block 'l2 to assist insup- The dies Il are arranged at the lower end of the carrier block l! in surrounding' relation to the chuck block l2. The upper facesof the diesV I I rideon the lower end of the carrier block Il. A pressure `ring Il is spaced below thecarrier block to shiftably or slidably support `the dies I3. The lower sides of the dies Il `slide on the upper surfaceof the ring Il and the ring serves to hold the dies in positions where their `upper sides ride on the l'tzuwer` end of thecarrier block 5I. e The ring Il is proportioned so that it is spaced entirely clear of the container C. vThe ring Il is suspended from the block $3 by spaced bolts see Fig. 9. 'I'he bolts 69 have their heads set in the lower end of the ring 6B and the bolts pass upwardly through vertical openings in the ring and the carrier block 5I. Nuts 10 are threaded on the upper parts of the bolts i9 and may be adjusted toobtain an` accurate setting of the ring Il so that the dies Il are held in sliding engagement with the under side of the carrier block I3. The nuts 1| are at the base of the boss il and, in accordancewith the "invenv tion, project beyond or overhang the'periphery of the carrier block Il. If desired or found necessary, washers 1I may be arranged under the nuts 10 to increase the overhang. `Radial slots 12 are formed in the dies Il lto slidably pass the bolts I9. I prefer to have a bolt 69 pass througheach die I3. with the bolts 6 9 limits the vextent of movement of the dies Il and guides the dies for in and out movement. t

o Spring means are provided for normally holding thedies Il in their out or extended positions and for returning the dies to these positions following each operation. `The opposing radial edges Ml of the dies I 3 have aligned transverse sockets Il kand compression springs 14 are engaged in these sockets. Thesprings 14 engage between-the adjacentdies I3 and urge the dies outwardly. The inner ends of the slots 12 are positions. y

Themeans Il is operated by the power driven means II to produce reciprocation of the chuck I2 .and inward actuation of the dies I3. The v means I4 includes a ring or`sleevel 1,5 slidably engaged `on or telescoped over the carrier block `53. Thefsleeve I5 is operatively connected with` and carried by the wrist pin 28 of the above described toggle mechanism. Spacedstems orrods 18 are threaded in sockets inthe upper end of the sleeve 15 and pass upwardly through openings 11 in the guide 58.- The rods 16 are slidable` in the openings 11 to guide the sleeve` 15 and to assist in guiding the chuck I 2. The rodsl pass through openings in the end portions of the pin 2l vand nuts 1Q are threaded on the rods 16 to clamp against flat upper andlower surfaces 1,9 of the pink! toattach the rods to the pin.` The nuts 1l may be adjusted to accurately set or adjust the sleeve 1l. It will be seen that the means II. operating through the medium of the The cooperation of the slots 12` wrist pin 28 and rods 18 is operative to reciprocate the sleeve 15.

`As best illustrated in Fig. 9 of the drawings,

the upper end of the sleeve 15 is engageable with the nuts 10 or the washers 1I., 'I'his occurs during the up stroke of the sleeve and the engagement causes the chuck I2 to be raised with the sleeve during the final or second portion of lits upward movement. In this way the sleeve 15 is adapted to raise the chuck I2 to the retracted position illustrated in Fig. 5.

The sleeve 15 is in the nature ofa cam for actuating the dies I3. The lower portion ofthe sleeve 15 has an internal downwardly and inwardly sloping cam face 80 for cooperating withv the pitched peripheral faces 83 of the dies I3. During the second or final portion of downward movement of the sleeve 15 the chuck I2 is held against further downward movement by its engagement with the container end E and as the sleeve 15 continues to move downwardly its face 80 cooperates with the faces 83 to force the dies I3 inwardly so that they seam the end E onto the container C. This action will be more fully described.

The seaming head H may further include means for stripping or disengaging the containers C from the head during the return or upward strokes of the chuck I2. This means may include a pair of spaced stripper rods 8l fixed in the stationaryv guide 58 and extending downwardly therefrom to be received in openings 82 in the carrier block 53. Openings 83 are provided in the chuck block 52 to pass or receive the stripper rods 8|. When the chuck I2 is moved upwardly by the engagement of the sleeve 15 with the washers 1I or the nuts 10, the openings 83 receive the stripper rods 8| and the rods ultimately extend from the lower ends of the openings 88 so that they engage the container end E in the event the container remains engaged on the upwardly moving chuck. The relative movement between the chuck I2 and the stationary stripper rods 8| frees or disengages the container C from the chuck.

In the operation of the machine, the container C carrying the end E is placed on the table 44 and is positioned against the block 48 to be oriented with respect to the head H. At this time the head H is in its raised position illustrated in Figs. 1, 2 and 5 and the container may be'rfe'tdily positioned under the head. When the container is in position the clutch sleeve 35 is engaged or clutched with the wheel 30 by depressing the pedal 42. This produces rotation of the shaft 2i and operation of the toggle means -21. 'Ihe toggle means moves the sleeve 15 downwardly and then returns the sleeve to its normal raised position. During the rst part of the downward stroke of the sleeve 15 the chuck I2 moves downwardly with the sleeve under the action Yof grav` ity. The chuck I2 moves downwardly until the chuck block 52 is engaged in the container end E, at which time the downward movement of the chuck I2 is stopped by the engagement of the stud head 6I with the guide 58. This action positions the dies I3 at the seam curl 5I, The sleeve 25 continues to move downwardly and as it moves into secure holding and securing engagement with the wall of the containervC.

When the cam ring 15 begins its upward stroke the chuck I2 remains stationary under the action of gravity andthe sleeve moves upwardly with iracted positions clear'of the container. Followf ing the retraction of the dies Il! the upper end of the sleeve 15. engages the nuts 18' or the washers 1I and as the upiard movement ofthe sleeve 15 continues the vchuck I2 moves lupwardly with the sleeve.- In, thisV manner the chuck I2 is'returned to its retracted position lto bring the boss 56 against or adjacent the guide 58.V During the upward movement of the chuck I2 the stripper rods 8Ifproject from the under side of the chuck block 52 to strip or freethe container from the chuck in the event .the container tends to remain in the chuck. At the end' of theY seeming operation the container C is removed from under the head H and another' container carrying an end Eis positioned furthe next' operation.

Having described only a typical'preferred form and application of my invention, I do not wish to be limited or restricted to the specific details herein set forth, but wish to reserve to myself any variations` or modifications that may appear y end and operable to actuate the dies inwardly into seeming engagement with said end upon movement toward said end, relative to the chuck, and partson the chuck and cam initially supporting the chuck where the chuck is spacedfrom said end and disengaged to allow movement of the cam relative to thechuck when the chuck has come into engagement with said-end.

2. In a machine for seaming ends on containers, a support for a container which has an end arranged thereon, a. chuck movable into and out of engagement with said end, thechuck in-r cluding an anvil adapted to lengagev said end to fit within its seam, dies shiftablycarried by the chuck to bodilymovefin the horizontal plane occupied by the anvil, a cam for actuating the dies inwardly against said end to 'seam the same to the container and shiftably telescopically related to the chuck, means for moving the camQvertil cally toward and away from said container, and

parts on the chuck and cam initially engaging to support the chuck in spaced relation to said end, disengaged during movement of the cam toward said end when the chuck reaches said end so that the continued movement of the cam toward the container actuates the dies and re-engaged to move the chuck away from said `end during movement of the cam' away'from the container.

3. 'In a machine for sealnlng an end on a stationarlly supportedcontainer, a chuck movable from a retracted position above the container and a position at said end, a set of dies slidably supportedl on the lower endl of the chuck for in-z ward and outward movement, an overhanging abutment on the chuck, a sleeve slidable on the chuck,- means for moving the sleeve up andl down between a raised position where it engages the abutment to hold the chuck above the container end and a lower position where it has moved away from theabutment with the chuck at said end, the downward movement of the sleeve allowing the chuck to move downwardto the container end, a cam surface on the sleeve'for moving the dies inwardly to seam said end when the sleeve moves downwardly relative to .the

chuck, and meansl formoving the dies outwardly wh'en the sleeve, moves upwardly comprising compression springs engaged between the opposing edges of the dies. Y

'1. In a machine for seaming an end on a stationarily supported container, a chuck movable from a retracted position above the container and a position at said end, a set of dies slidably supported on the lower end of the chuck for inward andoutward movement, an overhanging abutment on` the chuck, a sleeve slidable on the chuck. means for moving the sleeve up and down between 'a raised position where it engages the abutment to hold the chuck above the container end anda lower position where it has moved `away from the abutment-with the chuck'at said end, the downward movement of the sleeve al- 4. `Ina machine for seaming an enden a stay' tionarily supported container, a sleeve movable up and down relative to the container, power means for moving the sleeve. av movable chuck within the sleevel adapted to engage within the container end, a downwardly facing shoulder on the chuck adapted to' rest on .the sleeve when the sleeve is in its raisedposition to hold the.

' upwardly relative to the chuck.

5. In a machine for seaming an end on a stationarily supported container, a chuck movable from a retracted position clear of the container and a position at said container end, a ring spaced below the chuck, bolts carrying' the ring and passing upwardly through the chuck, dies shiftably held between the ring and chuck for bodily inward and outward movement, a shiftable sleeve telescoping over the chuck and having a cam face at its lower portion for forcing the dies inwardly, means for moving the sleeve up and down, and parts on the bolts engaged by the upper end of the sleeve to support the chuck when the sleeve is in its raised position and to allow the chuck to move down to the container end during a part ofthe downward movement of the sleeve, the cam face actuating the dies inwardly during the remainder of the downward movement of the sleeve. n

6.. In a machine for seaming an end on a stationarily supported container, a chuck movable from a retracted position clear of the container and a position at said container end, a ring spaced below the chuck, bolts carrying the ring and passing upwardly through the chuck, dies shiftably held between the ring and chuck for inward and outward movement, the dies having slots receiving the bolts to be guided by the bolts, a shiftable sleeve telescoping over the chuck and having a cam face at its lower portion for foreing the dies inwardly, means for, moving the sleeve up and down, and parts on the bolts engaged by the upper end of the sleeve to support the chuck when the sleeve is in its raised position and to allow the chuck to move down to the container end during a part o! the downward movement of the sleeve, the cam face actuating the dies inwardly during the remainder of the downward movement of the sleeve.

Vlowing the chuck to move downward to the containe'end, a cam surface on the sleeve for moving thedies inwardly to seam said end when the sleeve moves downwardly relative to the chuck, and means for stripping the container from the chuck during upward movement of the chuck comprising a fixed rod received in an opening in the chuck to project from its lower end when thechuck is in a raised position.

8. A machine for seaming ends on containers comprising a frame, a ltableon'the frame for supporting a container, a guide above the table,

l a chuck guided by the guide for movement between a `raised position cleary of the container and a lowered position where it engages in the end of .the container, a set of bodilymovable dies on the lower end of the chuck, a sleeve shiftably-telescoped over the chuck and having a cam face for actuating the dies upon downward movement of the sleeve relative to the chuck to seam the end on the container, rods on the sleeve guided by the guide, power driven means on the frame for reciprocating the rods, and a shoulder on the chuck engaged by the sleeve when the sleeve is raised to hold the chuck above the container and re-engaged by the sleeve to return the chuck to its raised position when the sleeve moves upwardly, the chuck moving down to the container end by gravity during the rst portion of the down stroke of the sleeve. i

9. In a machine for seaming an end on a container, the end having a raised seam, the machine including a chuck movable between a retracted position and a position at the container end, an anvil on the chuck adapted to fit within the seam when the chuck is in the position at the container, the anvil having a shelf opposing the end of the chuck, a set of bodily shiftable dies having parts engaged between said shelf and the end of the chuck to be guided for movement toward and. away from the seam, cam means for simultaneously moving the dies inwardly against the seam when the anvil is within the seam, and means for shifting the dies outwardly.

10. In a machine for seaming an end on a container, the end having a raised seam, the machine including a chuck movable between a retracted position and a position at the container end, an anvil on the chuck adapted to nt within the seam when the chuck is in the position at the container, the anvil having a shelf oppos ing the end of the chuck and extending inwardly from the periphery of the anvil, a support carried bythe chuck and spaced below its lower end, a set of dies shiftably supported between the end of the chuck and the support for bodily movement inwardly toward the seam, the dies having tongues on their inner edges slidably received between said shelf and .the end of the chuck for guiding the dies directly above where I chine including a chuck'movable between a. re-

tracted position and a position at the container end, an anvil on the chuck adapted to nt with- Ain the seam when the chuck is in the position at the container, a set of dies supported at the lower end of the chuck for individual movement toward the seam, and a member movable relative to the chuck having a sloping surface which cooperates with the dies in the horizontal plane occupied by the anvil to force the dies inwardly.

lesv

12. In a machine for seaming an end on a container, the end having a raised rectangular seam bead, the machine comprising a support `for the container, a chuck body movable toward the container, a rectangular` anvil o n theA body adapted to iit within the bead, a set of bodily shiftable dies supportedfat the lower end ofthe body. to move inwardly, against the seam, each die having two angularly related active faces tor cooperating with .two angularly related parts of the seam which Join ai: a corner of the seam, and means for moving the dies inwardly against the seam,

WILLIAM J. aEis'r. 

